ROLE OF ABIOTIC AND BIOTIC FACTORS IN RESEARCH OF VARIETES OF WEIGELA (WEIGELA THUNB., CAPRIFOLIACEAE)

Aim. The success of the introduction of plants depends on their vitality and adaptation to the new conditions of existence. The aim of our study is to identify environmental characteristics of varieties of Weigela to extend the range of ornamental plants under urban ecosystem of Krasnodar. We have analyzed the tolerance of varieties of Weigela to the temperature regime in the introduction region, we explored the complex biotic factors influencing the growth and development of these plants, and also studied the morphological characteristics of pollen and pollen productivity of Weigela flowers.

Methods. Evaluation of resistance of varieties of Weigela to a complex of abiotic and biotic factors has been conducted in the field and in the laboratory, taking into account recommendations for ornamental shrubs.

Results. Studied Weigela varieties have enough ecological valence to the force of impact of the maximum and minimum air temperatures in the area of the introduction. The most resistant to the complex of summer stress factors are the following varieties of Weigela: 'Candida', 'Nana Variegata', 'Olimpik Flame', 'Red Rrince'. The most heat-resistant varieties are 'Nana Variegata' and 'Olimpik Flame'. The most winter-hardy varieties are 'Candida' and 'Red Rrince', less winter-hardy variety is 'Nana Purpurea'. The most cold-resistant variety is 'Candida'. 'Nana Variegata' produces the highest number of fertile pollen grains. The smallest amount of fertile pollen is formed by 'Nana Purpurea'.

Main conclusion. These studies allow us to conclude that all the studied varieties of Weigela are characterized by a high degree of adaptation and deserve widespread use in gardens and parks of the city of Krasnodar.

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